Question

The given figure shows the diagrammatic cross sectional view of a muscle with their parts marked as 1, 2, 3 and 4. Which part is held together by a common collagenous connective tissue layer?

A. 1
B. 2
C. 3
D. 4

Answer 1

Hint: The complete figure given represents a section of muscle anatomy. It depicts the constitution of a skeletal or a voluntary muscle. Along with it, it shows the intervention of the blood vessels that provide nutrients to the muscle.

Complete Step by Step Answer:
Figure 1 depicts muscle fibre.
Muscle fibres are simply another term for muscle cells surrounded by a connective tissue layer called endomysium. These are made up of myofibrils. Myofibrils, in turn, are composed of actin and myosin filaments. A bundle of muscle fibres constitutes a fascicle which is wrapped around by a connective layer called perimysium.

Figure 2 depicts sarcolemma. It refers to the plasma membrane of a muscle fibre. This plays a significant role in contraction of voluntary muscles. Other than that, it performs a basic function as that of a plasma membrane, that is, providing a barrier to the cell from the external environment.

Figure 3 depicts blood capillary. The vascular system in a skeletal muscle is complex. Each muscle cell /fibre is provided with a capillary .

Figure 4 depicts fascicles. As stated above. It is a bundle of muscle fibres. The connective tissue/perimysium that it is surrounded with is collagenous.

Thus, the correct answer is D: 4



Note: Connective tissue, as the name implies, are the tissues to connect tissues, of same or different origin. There are 4 major types of connective tissues: Loose connective tissue, Dense connective tissue, Specialised connective tissue.